Groco Stainless Steel Hose Thru-Hull Fitting Groco stainless steel thru-hull fittings are constructed of durable 316 stainless steel and are available in a range of sizes. NPS thread with hose connection UL Listed 647B Specifications Part Number Thread NPS Hose ID A B C D E Weight HTH-750S 34 34 2.7 0.3 1.9 1.2 1.3 0.6 lbs. HTH-1000S 1 1 2.8 0.3 2.3 1.2 1.3 0.8 lbs. HTH-1125S 1 1-18 2.8 0.3 2.3 1.2 1.3 1.0 lbs. HTH-1250S 1-14 1-14 2.8 0.3 2.6 1.1 1.3 1.1 lbs. HTH-1500S 1-12 1-12 2.8 0.3 2.9 1.1